Non-executable mappings now in NetBSD too

[Tim Kientzle]

Pedro F. Giffuni wrote:
> Just for reference, I found links to these interesting postings on NetBSD and
> OpenBSD respectively:
> 
> http://mail-index.netbsd.org/tech-kern/2003/08/24/0009.html
> 
> http://www.sigmasoft.com/~openbsd/archive/openbsd-tech/200301/msg00251.html
> 
> Last time I asked, I learned our signal trampoline had been impleneted on
> userland like on NetBSD's IRIX emulation (not sure about all platforms though),
> so work on this would be really good.

The OpenBSD work on tightening up read/write/exec memory permissions
looks interesting, but I wonder what impact it has on
JIT technologies; do the current Java VMs or other incremental
compilation engines require write+exec?

Tim